java.nio.Buffer Class的reset()方法用于将该缓冲区的位置重置为previously-marked位置。调用此方法既不会更改,也不会丢弃标记的值。
用法:
public Buffer reset()
返回值:此方法返回此缓冲区。
下面是说明reset()方法的示例:
范例1:
// Java program to demonstrate
// reset() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
byte[] barr = { 10, 20, 30, 40 };
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.wrap(barr);
// Typecast ByteBuffer to buffer
Buffer buffer = (Buffer)bb;
// try to set the position at index 2
buffer.position(2);
// Set this buffer mark position
// using mark() method
buffer.mark();
// try to set the position at index 4
buffer.position(4);
// display position
System.out.println("position before reset:"
+ buffer.position());
// try to call reset() to restore
// to the position we marked
buffer.reset();
// display position
System.out.println("position after reset:"
+ buffer.position());
}
catch (InvalidMarkException e) {
System.out.println("new position is less than "
+ "the position we marked before ");
System.out.println("Exception throws:" + e);
}
}
}
输出:
position before reset:4 position after reset:2
范例2:
// Java program to demonstrate
// reset() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
try {
byte[] barr = { 10, 20, 30, 40 };
// creating object of ByteBuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.wrap(barr);
// Typecast ByteBuffer to buffer
Buffer buffer = (Buffer)bb;
// try to set the position at index 2
buffer.position(2);
// Set this buffer mark position
// using mark() method
buffer.mark();
// try to set the position at index 4
buffer.position(1);
// display position
System.out.println("position before reset:"
+ buffer.position());
// try to call reset() to restore
// to the position we marked
buffer.reset();
// display position
System.out.println("position after reset:"
+ buffer.position());
}
catch (InvalidMarkException e) {
System.out.println("\nnew position is less than "
+ "the position we marked before ");
System.out.println("Exception throws:" + e);
}
}
}
输出:
position before reset:1 new position is less than the position we marked before Exception throws:java.nio.InvalidMarkException
参考: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#reset-
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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Buffer reset() methods in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。